Investigation of enhanced capability thermal-barrier coating systems for diesel-engine components. Final report
Material systems and processes for the development of effective and durable thermal barriers for heavy-duty diesel engines were investigated. Seven coating systems were evaluated for thermal conductivity, erosion resistance, corrosion/oxidation resistance, and thermal-shock resistance. An advanced coating system based on plasma-sprayed particle yttria stabilized zirconia (PS/HYSZ) was judged superior in these tests. The measured thermal conductivity of the selected coating was 0.893 W/m C at 371 C. The PS/HYSZ coating system was applied to the piston crown, fire deck and valves of a single cylinder low heat rejection diesel engine. The coated engine components were tested for 24 hr at power levels from 0.83 MPa to 1.17 MPa brake mean effective pressure. The component coatings survived the engine tests with a minimum of distress. The measured fire deck temperatures decreased 86 C on the intake side and 42 C on the exhaust side with the coating applied.
- Research Organization:
- General Motors Corp., Indianapolis, IN (USA)
- OSTI ID:
- 5680926
- Report Number(s):
- N-85-18154; NASA-CR-174820; DOE/NASA-0326-1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330102* -- Internal Combustion Engines-- Diesel
36 MATERIALS SCIENCE
360205 -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
CHALCOGENIDES
COATINGS
CORROSION RESISTANCE
DIESEL ENGINES
ENERGY TRANSFER
ENGINES
EROSION
HEAT ENGINES
HEAT TRANSFER
HIGH TEMPERATURE
INTERNAL COMBUSTION ENGINES
MATERIALS TESTING
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PISTONS
SPRAYED COATINGS
TESTING
THERMAL CONDUCTIVITY
THERMAL SHOCK
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES